Find length size of an array in jquery

Question

I think I m going crazy   I have a simply question that I m struggling with for some reason   Why does the below return  undefined    var testvar     testvar 1  2  testvar 2  3  alert testvar length     edit I originally typed testvar 1  length   I knew this to be an error   I meant testvar length

User · Answer

If length is undefined you can use  function count array        var c   0      for i in array     in returns key  not object         if array i     undefined              c         return c     var total   count array

User · Answer

var mode                          input name  mode     checked   each function i                        mode push   this  val                         if mode length    0                                       alert  Please select mode

User · Answer

var array      array push array      insert the array value using push methods   for  var i   0  i  lt  array length  i              nameList         array i                   display the array value                                                                     id class   html array length       find the array length

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obj        each obj  function  key  value        console log key          value     push the object value      for  var i in obj        nameList     quot  quot    obj i     quot  quot    display the object value       quot id class quot   html   nameList  length    display the length of object

User · Answer

Because 2 isn t an array  it s a number  Numbers have no length   Perhaps you meant to write testvar length  this is also undefined  since objects  created using the         notation  do not have a length   Only arrays have a length property   var testvar         testvar 1    2  testvar 2    3  alert testvar length         3   Note that Javascript arrays are indexed starting at 0 and are not necessarily sparse  hence why the result is 3 and not 2 -- see this answer for an explanation of when the array will be sparse and when it won t

User · Answer

Integer has no method length  Try string  var testvar     testvar 1   2   alert testvar 1  length

User · Answer

testvar 1  is the value of that array index  which is the number 2   Numbers don t have a length property  and you re checking for 2 length which is undefined   If you want the length of the array just check testvar length

[jquery] Find length (size) of an array in jquery

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